///////////////////////////////////////////////////////////////////////////////////////////////////
// OpenGL Mathematics Copyright (c) 2005 - 2011 G-Truc Creation (www.g-truc.net)
///////////////////////////////////////////////////////////////////////////////////////////////////
// Created : 2008-08-18
// Updated : 2010-02-04
// Licence : This source is under MIT License
// File    : glm/core/type_tvec2.hpp
///////////////////////////////////////////////////////////////////////////////////////////////////

#ifndef glm_core_type_gentype2
#define glm_core_type_gentype2

#include "type_vec.hpp"
#include "type_float.hpp"
#include "type_int.hpp"
#include "type_size.hpp"
#include "_swizzle.hpp"

namespace glm{
namespace detail
{
	template <typename T> struct tref2;
	template <typename T> struct tref3;
	template <typename T> struct tref4;
	template <typename T> struct tvec3;
	template <typename T> struct tvec4;

	//! The basic 2D vector type.
	//! \ingroup core_template
	template <typename T>
	struct tvec2
	{
		enum ctor{null};

		typedef T value_type;
		typedef std::size_t size_type;
		GLM_FUNC_DECL size_type length() const;
		static GLM_FUNC_DECL size_type value_size();

		typedef tvec2<T> type;
		typedef tvec2<bool> bool_type;

		//////////////////////////////////////
		// Data

#		if(GLM_COMPONENT == GLM_COMPONENT_ONLY_XYZW)
		value_type x, y;
#		elif(GLM_COMPONENT == GLM_COMPONENT_MS_EXT)
		union 
		{
			struct{value_type r, g;};
			struct{value_type s, t;};
			struct{value_type x, y;};
		};
#		else//(GLM_COMPONENT == GLM_COMPONENT_GLSL_NAMES)
		union {value_type x, r, s;};
		union {value_type y, g, t;};
#		endif//GLM_COMPONENT

		//////////////////////////////////////
		// Accesses

		GLM_FUNC_DECL value_type & operator[](size_type i);
		GLM_FUNC_DECL value_type const & operator[](size_type i) const;

		//////////////////////////////////////
		// Implicit basic constructors

		GLM_FUNC_DECL tvec2();
		GLM_FUNC_DECL tvec2(tvec2<T> const & v);

		//////////////////////////////////////
		// Explicit basic constructors

		GLM_FUNC_DECL explicit tvec2(
			ctor);
		GLM_FUNC_DECL explicit tvec2(
			value_type const & s);
		GLM_FUNC_DECL explicit tvec2(
			value_type const & s1, 
			value_type const & s2);

		//////////////////////////////////////
		// Swizzle constructors

		tvec2(tref2<T> const & r);

		//////////////////////////////////////
		// Convertion constructors

		//! Explicit converions (From section 5.4.1 Conversion and scalar constructors of GLSL 1.30.08 specification)
		template <typename U> 
		GLM_FUNC_DECL explicit tvec2(
			U const & x);
		//! Explicit converions (From section 5.4.1 Conversion and scalar constructors of GLSL 1.30.08 specification)
		template <typename U, typename V> 
		GLM_FUNC_DECL explicit tvec2(
			U const & x, 
			V const & y);

		//////////////////////////////////////
		// Convertion vector constructors

		//! Explicit conversions (From section 5.4.1 Conversion and scalar constructors of GLSL 1.30.08 specification)
		template <typename U> 
		GLM_FUNC_DECL explicit tvec2(tvec2<U> const & v);
		//! Explicit conversions (From section 5.4.1 Conversion and scalar constructors of GLSL 1.30.08 specification)
		template <typename U> 
		GLM_FUNC_DECL explicit tvec2(tvec3<U> const & v);
		//! Explicit conversions (From section 5.4.1 Conversion and scalar constructors of GLSL 1.30.08 specification)
		template <typename U> 
		GLM_FUNC_DECL explicit tvec2(tvec4<U> const & v);

		//////////////////////////////////////
		// Unary arithmetic operators

		GLM_FUNC_DECL tvec2<T> & operator= (tvec2<T> const & v);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator= (tvec2<U> const & v);

		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator+=(U const & s);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator+=(tvec2<U> const & v);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator-=(U const & s);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator-=(tvec2<U> const & v);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator*=(U const & s);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator*=(tvec2<U> const & v);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator/=(U const & s);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator/=(tvec2<U> const & v);
		GLM_FUNC_DECL tvec2<T> & operator++();
		GLM_FUNC_DECL tvec2<T> & operator--();

		//////////////////////////////////////
		// Unary bit operators

		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator%= (U const & s);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator%= (tvec2<U> const & v);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator&= (U const & s);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator&= (tvec2<U> const & v);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator|= (U const & s);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator|= (tvec2<U> const & v);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator^= (U const & s);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator^= (tvec2<U> const & v);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator<<=(U const & s);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator<<=(tvec2<U> const & v);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator>>=(U const & s);
		template <typename U> 
		GLM_FUNC_DECL tvec2<T> & operator>>=(tvec2<U> const & v);

		//////////////////////////////////////
		// Swizzle operators

		GLM_FUNC_DECL value_type swizzle(comp X) const;
		GLM_FUNC_DECL tvec2<T> swizzle(comp X, comp Y) const;
		GLM_FUNC_DECL tvec3<T> swizzle(comp X, comp Y, comp Z) const;
		GLM_FUNC_DECL tvec4<T> swizzle(comp X, comp Y, comp Z, comp W) const;
		GLM_FUNC_DECL tref2<T> swizzle(comp X, comp Y);
	};

	template <typename T>
	struct tref2
	{
		GLM_FUNC_DECL tref2(T & x, T & y);
		GLM_FUNC_DECL tref2(tref2<T> const & r);
		GLM_FUNC_DECL tref2(tvec2<T> const & v);

		GLM_FUNC_DECL tref2<T> & operator= (tref2<T> const & r);
		GLM_FUNC_DECL tref2<T> & operator= (tvec2<T> const & v);

		T& x;
		T& y;
	};

	GLM_DETAIL_IS_VECTOR(tvec2);

} //namespace detail

namespace core{
namespace type{
namespace precision
{
	//! 2 components vector of high precision floating-point numbers. 
	//! There is no guarantee on the actual precision.
	//! From GLSL 1.30.8 specification, section 4.5.2 Precision Qualifiers.
	//! \ingroup core_precision
	typedef detail::tvec2<highp_float>		highp_vec2;

	//! 2 components vector of medium precision floating-point numbers. 
	//! There is no guarantee on the actual precision.
	//! From GLSL 1.30.8 specification, section 4.5.2 Precision Qualifiers.
	//! \ingroup core_precision
	typedef detail::tvec2<mediump_float>	mediump_vec2;

	//! 2 components vector of low precision floating-point numbers. 
	//! There is no guarantee on the actual precision.
	//! From GLSL 1.30.8 specification, section 4.5.2 Precision Qualifiers.
	//! \ingroup core_precision
	typedef detail::tvec2<lowp_float>		lowp_vec2;

	//! 2 components vector of high precision signed integer numbers. 
	//! There is no guarantee on the actual precision.
	//! From GLSL 1.30.8 specification, section 4.1.5 Precision Qualifiers.
	//! \ingroup core_precision
	typedef detail::tvec2<highp_int>		highp_ivec2;

	//! 2 components vector of medium precision signed integer numbers. 
	//! There is no guarantee on the actual precision.
	//! From GLSL 1.30.8 specification, section 4.1.5 Precision Qualifiers.
	//! \ingroup core_precision
	typedef detail::tvec2<mediump_int>		mediump_ivec2;

	//! 2 components vector of low precision signed integer numbers.
	//! There is no guarantee on the actual precision.
	//! From GLSL 1.30.8 specification, section 4.1.5 Precision Qualifiers.
	//! \ingroup core_precision
	typedef detail::tvec2<lowp_int>			lowp_ivec2;
	
	//! 2 components vector of high precision unsigned integer numbers. 
	//! There is no guarantee on the actual precision.
	//! From GLSL 1.30.8 specification, section 4.1.5 Precision Qualifiers.
	//! \ingroup core_precision
	typedef detail::tvec2<highp_uint>		highp_uvec2;

	//! 2 components vector of medium precision unsigned integer numbers. 
	//! There is no guarantee on the actual precision.
	//! From GLSL 1.30.8 specification, section 4.1.5 Precision Qualifiers.
	//! \ingroup core_precision
	typedef detail::tvec2<mediump_uint>		mediump_uvec2;

	//! 2 components vector of low precision unsigned integer numbers.
	//! There is no guarantee on the actual precision.
	//! From GLSL 1.30.8 specification, section 4.1.5 Precision Qualifiers.
	//! \ingroup core_precision
	typedef detail::tvec2<lowp_uint>		lowp_uvec2;

}//namespace precision
}//namespace type
}//namespace core
}//namespace glm

#ifndef GLM_EXTERNAL_TEMPLATE
#include "type_vec2.inl"
#endif//GLM_EXTERNAL_TEMPLATE

#endif//glm_core_type_gentype2
